Meaning of “midweek” - Learner’s Dictionary

midweek

noun [ U ] uk us /ˌmɪdˈwiːk/

the middle of the week, usually from Tuesday to Thursday

midweek adjective, adverb [ always before noun ]

in the middle of the week:

a midweek game/match
Flights are cheaper if you travel midweek.

(Definition of “midweek” from the Cambridge Learner’s Dictionary © Cambridge University Press)